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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/time/time.h" | 5 #include "base/time/time.h" |
6 | 6 |
7 #include <CoreFoundation/CFDate.h> | 7 #include <CoreFoundation/CFDate.h> |
8 #include <CoreFoundation/CFTimeZone.h> | 8 #include <CoreFoundation/CFTimeZone.h> |
9 #include <mach/mach.h> | 9 #include <mach/mach.h> |
10 #include <mach/mach_time.h> | 10 #include <mach/mach_time.h> |
11 #include <stddef.h> | 11 #include <stddef.h> |
12 #include <stdint.h> | 12 #include <stdint.h> |
13 #include <sys/sysctl.h> | 13 #include <sys/sysctl.h> |
14 #include <sys/time.h> | 14 #include <sys/time.h> |
15 #include <sys/types.h> | 15 #include <sys/types.h> |
16 #include <time.h> | 16 #include <time.h> |
17 | 17 |
18 #include "base/logging.h" | 18 #include "base/logging.h" |
19 #include "base/mac/mach_logging.h" | 19 #include "base/mac/mach_logging.h" |
20 #include "base/mac/scoped_cftyperef.h" | 20 #include "base/mac/scoped_cftyperef.h" |
21 #include "base/mac/scoped_mach_port.h" | 21 #include "base/mac/scoped_mach_port.h" |
22 #include "base/macros.h" | 22 #include "base/macros.h" |
23 #include "base/numerics/safe_conversions.h" | 23 #include "base/numerics/safe_conversions.h" |
24 #include "build/build_config.h" | 24 #include "build/build_config.h" |
25 | 25 |
26 #if defined(OS_IOS) | |
27 #include <time.h> | |
28 #include "base/ios/ios_util.h" | |
29 #endif | |
30 | |
26 namespace { | 31 namespace { |
27 | 32 |
28 #if defined(OS_MACOSX) && !defined(OS_IOS) | 33 #if defined(OS_MACOSX) && !defined(OS_IOS) |
29 int64_t MachAbsoluteTimeToTicks(uint64_t mach_absolute_time) { | 34 int64_t MachAbsoluteTimeToTicks(uint64_t mach_absolute_time) { |
30 static mach_timebase_info_data_t timebase_info; | 35 static mach_timebase_info_data_t timebase_info; |
31 if (timebase_info.denom == 0) { | 36 if (timebase_info.denom == 0) { |
32 // Zero-initialization of statics guarantees that denom will be 0 before | 37 // Zero-initialization of statics guarantees that denom will be 0 before |
33 // calling mach_timebase_info. mach_timebase_info will never set denom to | 38 // calling mach_timebase_info. mach_timebase_info will never set denom to |
34 // 0 as that would be invalid, so the zero-check can be used to determine | 39 // 0 as that would be invalid, so the zero-check can be used to determine |
35 // whether mach_timebase_info has already been called. This is | 40 // whether mach_timebase_info has already been called. This is |
36 // recommended by Apple's QA1398. | 41 // recommended by Apple's QA1398. |
37 kern_return_t kr = mach_timebase_info(&timebase_info); | 42 kern_return_t kr = mach_timebase_info(&timebase_info); |
38 MACH_DCHECK(kr == KERN_SUCCESS, kr) << "mach_timebase_info"; | 43 MACH_DCHECK(kr == KERN_SUCCESS, kr) << "mach_timebase_info"; |
39 } | 44 } |
40 | 45 |
41 // timebase_info converts absolute time tick units into nanoseconds. Convert | 46 // timebase_info converts absolute time tick units into nanoseconds. Convert |
42 // to microseconds up front to stave off overflows. | 47 // to microseconds up front to stave off overflows. |
43 base::CheckedNumeric<uint64_t> result(mach_absolute_time / | 48 base::CheckedNumeric<uint64_t> result(mach_absolute_time / |
44 base::Time::kNanosecondsPerMicrosecond); | 49 base::Time::kNanosecondsPerMicrosecond); |
45 result *= timebase_info.numer; | 50 result *= timebase_info.numer; |
46 result /= timebase_info.denom; | 51 result /= timebase_info.denom; |
47 | 52 |
48 // Don't bother with the rollover handling that the Windows version does. | 53 // Don't bother with the rollover handling that the Windows version does. |
49 // With numer and denom = 1 (the expected case), the 64-bit absolute time | 54 // With numer and denom = 1 (the expected case), the 64-bit absolute time |
50 // reported in nanoseconds is enough to last nearly 585 years. | 55 // reported in nanoseconds is enough to last nearly 585 years. |
51 return base::checked_cast<int64_t>(result.ValueOrDie()); | 56 return base::checked_cast<int64_t>(result.ValueOrDie()); |
52 } | 57 } |
53 #endif // defined(OS_MACOSX) && !defined(OS_IOS) | 58 #endif // defined(OS_MACOSX) && !defined(OS_IOS) |
54 | 59 |
60 // Returns monotonically growing number of ticks in milliseconds since some | |
miu
2017/05/22 22:16:14
s/milliseconds/microseconds/
kapishnikov
2017/05/23 17:56:50
Done.
| |
61 // unspecified starting point. | |
55 int64_t ComputeCurrentTicks() { | 62 int64_t ComputeCurrentTicks() { |
56 #if defined(OS_IOS) | 63 #if defined(OS_IOS) |
64 // iOS 10 supports clock_gettime(CLOCK_MONOTONIC, ...), which is | |
65 // around 15 times faster than sysctl() call. Use it if possible; | |
66 // otherwise, fall back to sysctl(). | |
67 if (base::ios::IsRunningOnIOS10OrLater()) { | |
68 struct timespec tp; | |
69 if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
miu
2017/05/22 22:16:14
Hmm...Curious that the POSIX compatibility layer w
kapishnikov
2017/05/23 17:56:50
I couldn't find the sources but my guess is that i
| |
70 return tp.tv_sec * 1000000 + tp.tv_nsec / 1000; | |
71 } | |
72 } | |
73 | |
57 // On iOS mach_absolute_time stops while the device is sleeping. Instead use | 74 // On iOS mach_absolute_time stops while the device is sleeping. Instead use |
58 // now - KERN_BOOTTIME to get a time difference that is not impacted by clock | 75 // now - KERN_BOOTTIME to get a time difference that is not impacted by clock |
59 // changes. KERN_BOOTTIME will be updated by the system whenever the system | 76 // changes. KERN_BOOTTIME will be updated by the system whenever the system |
60 // clock change. | 77 // clock change. |
61 struct timeval boottime; | 78 struct timeval boottime; |
ianswett
2017/05/19 19:22:58
I didn't realize we were already doing something d
| |
62 int mib[2] = {CTL_KERN, KERN_BOOTTIME}; | 79 int mib[2] = {CTL_KERN, KERN_BOOTTIME}; |
63 size_t size = sizeof(boottime); | 80 size_t size = sizeof(boottime); |
64 int kr = sysctl(mib, arraysize(mib), &boottime, &size, nullptr, 0); | 81 int kr = sysctl(mib, arraysize(mib), &boottime, &size, nullptr, 0); |
65 DCHECK_EQ(KERN_SUCCESS, kr); | 82 DCHECK_EQ(KERN_SUCCESS, kr); |
66 base::TimeDelta time_difference = | 83 base::TimeDelta time_difference = |
67 base::Time::Now() - (base::Time::FromTimeT(boottime.tv_sec) + | 84 base::Time::Now() - (base::Time::FromTimeT(boottime.tv_sec) + |
68 base::TimeDelta::FromMicroseconds(boottime.tv_usec)); | 85 base::TimeDelta::FromMicroseconds(boottime.tv_usec)); |
69 return time_difference.InMicroseconds(); | 86 return time_difference.InMicroseconds(); |
70 #else | 87 #else |
71 // mach_absolute_time is it when it comes to ticks on the Mac. Other calls | 88 // mach_absolute_time is it when it comes to ticks on the Mac. Other calls |
72 // with less precision (such as TickCount) just call through to | 89 // with less precision (such as TickCount) just call through to |
73 // mach_absolute_time. | 90 // mach_absolute_time. |
74 return MachAbsoluteTimeToTicks(mach_absolute_time()); | 91 return MachAbsoluteTimeToTicks(mach_absolute_time()); |
miu
2017/05/22 22:16:14
Also curious about this: Why don't we just call ma
kapishnikov
2017/05/23 17:56:50
mach_absolute_time() stops counting when an iOS de
| |
75 #endif // defined(OS_IOS) | 92 #endif // defined(OS_IOS) |
76 } | 93 } |
77 | 94 |
78 int64_t ComputeThreadTicks() { | 95 int64_t ComputeThreadTicks() { |
79 #if defined(OS_IOS) | 96 #if defined(OS_IOS) |
80 NOTREACHED(); | 97 NOTREACHED(); |
81 return 0; | 98 return 0; |
82 #else | 99 #else |
83 base::mac::ScopedMachSendRight thread(mach_thread_self()); | 100 base::mac::ScopedMachSendRight thread(mach_thread_self()); |
84 mach_msg_type_number_t thread_info_count = THREAD_BASIC_INFO_COUNT; | 101 mach_msg_type_number_t thread_info_count = THREAD_BASIC_INFO_COUNT; |
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274 return Clock::MAC_MACH_ABSOLUTE_TIME; | 291 return Clock::MAC_MACH_ABSOLUTE_TIME; |
275 #endif // defined(OS_IOS) | 292 #endif // defined(OS_IOS) |
276 } | 293 } |
277 | 294 |
278 // static | 295 // static |
279 ThreadTicks ThreadTicks::Now() { | 296 ThreadTicks ThreadTicks::Now() { |
280 return ThreadTicks(ComputeThreadTicks()); | 297 return ThreadTicks(ComputeThreadTicks()); |
281 } | 298 } |
282 | 299 |
283 } // namespace base | 300 } // namespace base |
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